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DMARC (Domain-based Message Authentication, Reporting & Conformance) is an email authentication protocol that builds on SPF and DKIM. It tells receiving mail servers what to do when a message fails authentication — and where to send reports about it.
Without a DMARC record, anyone can spoof your domain to send phishing emails. A properly configured DMARC policy protects your brand, improves deliverability, and gives you visibility into who is sending email on your behalf.
What Is a DMARC Policy?
A DMARC policy tells receiving email servers what to do when a message claiming to come from your domain fails SPF and DKIM authentication. The policy is defined in the p= tag of your DMARC DNS record. There are three possible values:
p=none
Monitor only. Failing messages are still delivered. This is a good starting point to collect reports and understand your email ecosystem, but it provides no protection against spoofing.
p=quarantine
Failing messages are sent to the spam/junk folder. This provides partial protection — spoofed emails reach the recipient but are flagged as suspicious. A good intermediate step before moving to reject.
p=reject
Failing messages are blocked entirely. This is the strongest protection and the recommended end goal. It prevents spoofed messages from ever reaching inboxes and significantly boosts your domain reputation.
Why DMARC Matters for Email Deliverability
Major mailbox providers like Gmail, Outlook, and Yahoo increasingly require DMARC as part of their sender requirements. Google and Yahoo made DMARC mandatory for bulk senders in February 2024.
A properly enforced DMARC policy (quarantine or reject) signals to mailbox providers that you take email authentication seriously. This can directly improve your inbox placement rates and protect your sending reputation from being damaged by spoofers.
DMARC also enables aggregate (rua) and forensic (ruf) reporting, giving you data about every source sending email using your domain. This visibility is essential for identifying unauthorized senders and misconfigurations in your legitimate email flows.
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MailerBit monitors your DMARC, SPF, and DKIM health automatically and alerts you when something needs attention.
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